a mini mental assessment would be a good start. If the patient is unable to follow instructions or retain them then there is no use trying to rehab them for independent transfers and ambulation. If your aim is ambulation with min to mod assist for patients with dementia of more than a mild degree, just walk them on a rollator with 1 to 2 assist to build up there endurance. You would also need to assess their balance reactions especially for tandem BOS as well as the "get up and go" test. Hope this helps